Question

name the figure below in two different ways.
symbol:
and

Explanation:

This is a ray, which is named by its endpoint first, followed by any other point on the ray. The endpoint here is D, and the ray extends through I and S. We can use the endpoint plus either of the other two points to name it.

Answer:

$\overrightarrow{DS}$ and $\overrightarrow{DI}$